Motor drive device and its operating method

Abstract

The present invention provides a drive device for motor drive and an operating method for the drive device. [Solution] The drive unit includes a battery module, a conversion circuit, an energy storage circuit, and a control switch. The conversion circuit is coupled to the motor, a first power terminal of the battery module, and a second power terminal of the battery module. The control switch and the energy storage circuit are connected in series between the first power terminal and the second power terminal. When the voltage value of the first power terminal is higher than a first set voltage value, the drive unit turns on the control switch to allow the energy storage circuit to store electrical energy from the first power terminal.

Description

Technical Field

[0001] The present invention relates to a driving device and an operation method for a driving device, and particularly to a driving device for motor driving and an operation method for a driving device.

Background Art

[0002] The driving device includes a battery module and a conversion circuit. The conversion circuit can provide the electrical energy stored in the battery module to the motor. The motor is driven by electrical energy. When the motor decelerates or brakes, the motor provides a back electromotive force. The conversion circuit recovers the electrical energy of the back electromotive force to the battery module. It should be noted that if the electrical energy of the back electromotive force is too large, the battery module may not withstand the voltage value and may be damaged. Similarly, the power switch of the conversion circuit may not withstand the voltage value and may be damaged. Therefore, when the motor decelerates or brakes, how to protect the driving device and extend the service life of the driving device has become one of the research focuses of those skilled in the art.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The present invention provides a driving device for motor driving and an operation method for a driving device that can reduce the risk of damage to the electrical energy from the motor.

Means for Solving the Problems

[0004] In one embodiment of the present invention, the drive device of the present invention is used to drive a motor. The drive device includes a battery module, a conversion circuit, an energy storage circuit, and a control switch. The conversion circuit is coupled to the motor, a first power terminal of the battery module, and a second power terminal of the battery module. The control switch and the energy storage circuit are connected in series between the first power terminal and the second power terminal. When the voltage value of the first power terminal is higher than a first set voltage value, the drive device turns on the control switch to allow the energy storage circuit to store electrical energy from the first power terminal.

[0005] In one embodiment of the present invention, the operating method is used for a drive device. The drive device is used to drive a motor. The drive device includes a battery module, a conversion circuit, an energy storage circuit, and a control switch. The conversion circuit is coupled to the motor, a first power terminal of the battery module, and a second power terminal of the battery module. The control switch and the energy storage circuit are connected in series between the first power terminal and the second power terminal. The operating method includes receiving the voltage value of the first power terminal; and, if the voltage value of the first power terminal is higher than a first set voltage value, turning on the control switch so that the energy storage circuit can store electrical energy from the first power terminal. [Effects of the Invention]

[0006] Based on the above, if the voltage value at the first power terminal is higher than the first set voltage value, the drive unit turns on the control switch to allow the energy storage circuit to store the electrical energy at the first power terminal. Therefore, if the voltage value at the first power terminal is too high, the energy storage circuit can store the electrical energy at the first power terminal, reducing the risk of damage to the electrical energy at the first power terminal. This can extend the service life of the drive unit. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of a drive device according to one embodiment of the present invention. [Figure 2]This is a schematic diagram of a drive device according to one embodiment of the present invention. [Figure 3] This is a schematic diagram of a drive device according to one embodiment of the present invention. [Figure 4] This is a flowchart illustrating the operation method of one embodiment of the present invention. [Modes for carrying out the invention]

[0008] Hereinafter, several embodiments of the present invention will be described in detail with reference to the accompanying drawings. When the same element symbol is shown in different drawings, they are considered to be the same or similar element. These embodiments represent only a part of the present invention and do not disclose all possible embodiments of the present invention. More precisely, these embodiments are merely examples within the scope of the patent application of the present invention.

[0009] Referring to Figure 1, Figure 1 is a schematic diagram of a drive device according to one embodiment of the present invention. In this embodiment, the drive device 100 is used to drive a motor MTR. The drive device 100 includes a battery module 110, a conversion circuit 120, an energy storage circuit 130, and a control switch 140. The conversion circuit 120 is coupled to the motor MTR, the first power terminal T1 of the battery module 110, and the second power terminal T2 of the battery module 110. In this embodiment, the conversion circuit 120 can drive the motor MTR using battery electrical energy PB1 from the battery module 110. For example, when it is necessary to drive the motor MTR, the conversion circuit 120 functions as a multiphase power inverter. The conversion circuit 120 converts DC battery electrical energy from the battery module 110 into AC driving electrical energy and provides the AC driving electrical energy to the motor MTR.

[0010] The control switch 140 and the energy storage circuit 130 are connected in series between the first power terminal T1 and the second power terminal T2. In this embodiment, for example, the first terminal of the energy storage circuit 130 is connected to the first power terminal T1. The control switch 140 is connected between the second terminal of the energy storage circuit 130 and the second power terminal T2. In some embodiments, the first terminal of the control switch 140 is connected to the first power terminal T1. The energy storage circuit 130 is connected between the second terminal of the control switch 140 and the second power terminal T2.

[0011] In this embodiment, if the voltage value V1 at the first power terminal T1 is higher than the first set voltage value, the drive unit 100 turns on the control switch 140 so that the energy storage circuit 130 can store electrical energy at the first power terminal T1. When the motor MTR is decelerating or braking, the motor MTR provides back electromotive force. When the motor MTR is decelerating or braking, the conversion circuit 120 functions as a rectifier and can convert the back electromotive force electrical energy from the motor MTR into battery electrical energy PB2. Thus, the voltage value V1 at the first power terminal T1 rises. The conversion circuit 120 can use the battery electrical energy PB2 to charge the battery module 110. The drive unit 100 receives the voltage value V1 at the first power terminal T1. If the voltage value V1 at the first power terminal T1 is higher than the first set voltage value, this means that the voltage value V1 at the first power terminal T1 is too high. Therefore, the drive unit 100 turns on the control switch 140 so that the energy storage circuit 130 and the conversion circuit 120 can form a charging circuit for the energy storage circuit 130. The energy storage circuit 130 can store electrical energy from the first power terminal T1.

[0012] Furthermore, if the voltage value V1 at the first power terminal T1 is too high, the energy storage circuit 130 stores the electrical energy at the first power terminal T1, reducing the risk of the electrical energy at the first power terminal T1 damaging the drive unit 100. This extends the service life of the drive unit 100. The energy storage circuit 130 also recovers the electrical energy at the first power terminal T1. The energy storage circuit 130 can achieve energy-saving effects.

[0013] In this embodiment, the conversion circuit 120 includes power switches PS1 to PS6. Power switch PS1 has a diode D1. The first terminal of power switch PS1 is coupled to the first power terminal T1. The second terminal of power switch PS1 is coupled to the motor MTR. The control terminal of power switch PS1 receives a switching signal S1. Power switch PS2 has a diode D2. The first terminal of power switch PS2 is coupled to the second terminal of power switch PS1. The second terminal of power switch PS2 is coupled to the second power terminal T2. The control terminal of power switch PS2 receives a switching signal S2.

[0014] Furthermore, the cathode of diode D1 is coupled to the first terminal of power switch PS1. The anode of diode D1 is coupled to the second terminal of power switch PS1. The cathode of diode D2 is coupled to the first terminal of power switch PS2. The anode of diode D2 is coupled to the second terminal of power switch PS2. In this embodiment, power switches PS1 and PS2 form the first bridge arm in the conversion circuit 120.

[0015] Power switch PS3 has diode D3. The first terminal of power switch PS3 is coupled to the first power terminal T1. The second terminal of power switch PS3 is coupled to the motor MTR, and the control terminal of power switch PS3 receives the switching signal S3. Power switch PS4 has diode D4. The first terminal of power switch PS4 is coupled to the second terminal of power switch PS3. The second terminal of power switch PS4 is coupled to the second power terminal T2. The control terminal of power switch PS4 receives the switching signal S4.

[0016] Furthermore, the cathode of diode D3 is coupled to the first terminal of power switch PS3. The anode of diode D3 is coupled to the second terminal of power switch PS3. The cathode of diode D4 is coupled to the first terminal of power switch PS4. The anode of diode D4 is coupled to the second terminal of power switch PS4. In this embodiment, power switches PS3 and PS4 form a second bridge arm in the conversion circuit 120.

[0017] Power switch PS5 has diode D5. The first terminal of power switch PS5 is connected to the first power terminal T1. The second terminal of power switch PS5 is connected to the motor MTR. The control terminal of power switch PS5 receives the switching signal S5. Power switch PS6 has diode D6. The first terminal of power switch PS6 is connected to the second terminal of power switch PS5. The second terminal of power switch PS6 is connected to the second power terminal T2. The control terminal of power switch PS6 receives the switching signal S6.

[0018] Furthermore, the cathode of diode D5 is coupled to the first terminal of power switch PS5. The anode of diode D5 is coupled to the second terminal of power switch PS5. The cathode of diode D6 is coupled to the first terminal of power switch PS6. The anode of diode D6 is coupled to the second terminal of power switch PS6. In this embodiment, power switches PS5 and PS6 form a third bridge arm in the conversion circuit 120.

[0019] In this embodiment, the motor MTR may be a motor of an elevator system, but the present invention is not limited thereto. The first set voltage value can be set to, for example, 340 to 350 volts, but the present invention is not limited thereto. In this embodiment, the battery module 110 is implemented by an aluminum-ion battery, but the present invention is not limited thereto.

[0020] In this embodiment, the power switches PS1 to PS6 may each be implemented by at least one insulated gate bipolar transistor (IGBT) or at least one arbitrary type of field effect transistor (FET).

[0021] In this embodiment, the control switch 140 includes a transistor TB and a diode DB. The first terminal of the transistor TB is coupled to the first terminal of the control switch 140. The second terminal of the transistor TB is coupled to the second terminal of the control switch 140. The control terminal of the transistor TB receives a switching signal SSWB. The cathode of the diode DB is coupled to the first terminal of the control switch 140. The anode of the diode DB is coupled to the second terminal of the control switch 140. The present invention is not limited to the aspect of the control switch 140 of this embodiment. The control switch 140 may be implemented by a relay, an IGBT, or an arbitrary type of FET.

[0022] In this embodiment, when the voltage value V1 of the first power supply terminal T1 is less than or equal to the first set voltage value, the drive device 100 turns off the control switch 140.

[0023] Also, in this embodiment, when the control switch 140 is on, when the voltage value of the energy storage circuit 230 is lower than the voltage value V1 of the first power supply terminal T1, the battery module 110 can charge the energy storage circuit 230.

[0024] Referring to FIG. 2, FIG. 2 is a schematic diagram of a drive device according to an embodiment of the present invention. In this embodiment, the drive device 200 includes a battery module 110, a conversion circuit 120, an energy storage circuit 230, a control switch 140, and a control circuit 250. Since the connection methods of the battery module 110, the conversion circuit 120, and the control switch 140 are clearly described in the embodiment of FIG. 1, repeated descriptions are omitted.

[0025] In this embodiment, the energy storage circuit 230 includes a switch SW1 and an energy storage battery 231. The first terminal of the switch SW1 is coupled to the first power terminal T1. The energy storage battery 231 is coupled between the second terminal of the switch SW1 and the control switch 140. When the voltage value V1 of the first power terminal T1 is higher than the first set voltage value VS1, the drive unit 200 turns on the control switch 140 and the switch SW1.

[0026] Furthermore, the control circuit 250 receives the voltage value V1 at the first power supply terminal T1. If the voltage value V1 at the first power supply terminal T1 is higher than the first set voltage value VS1, the control circuit 250 turns on the control switch 140 and switch SW1. For example, the control circuit 250 is coupled to the first power supply terminal T1, the control terminal of switch SW1, and the control terminal of control switch 140. The control circuit 250 can control the control switch 140 using the switching signal SSWB and control switch SW1 using the switching signal SSW1.

[0027] Furthermore, the control circuit 250 can also control the switching operation of the power switches PS1 to PS6 of the conversion circuit 120.

[0028] In this embodiment, if the voltage value V1 of the first power terminal T1 is less than or equal to the first set voltage value VS1, the drive device 200 can turn off the control switch 140 and switch SW1 using the control circuit 250.

[0029] In this embodiment, switch SW1 may be implemented by any type of transistor switch or relay.

[0030] Furthermore, when the control switch 140 and switch SW1 are off, if the voltage value V1 at the first power terminal T1 is lower than the reference voltage of the battery module 110, this means that the battery module 110 has insufficient electrical energy. In the above situation, if the voltage value of the energy storage battery 231 is greater than the voltage value V1 at the first power terminal T1, the drive unit 200 can turn on switch SW1 using the control circuit 250. Therefore, the energy storage battery 231 can charge the battery module 110. In the above situation, if the voltage value of the energy storage battery 231 is greater than the voltage value V1 at the first power terminal T1, the drive unit 200 can turn on switch SW1 and control switch 140.

[0031] Referring to Figure 3, Figure 3 is a schematic diagram of a drive device according to one embodiment of the present invention. In this embodiment, the drive device 300 includes a battery module 110, a conversion circuit 120, an energy storage circuit 330, a control switch 140, and a control circuit 350. The method of coupling the battery module 110, the conversion circuit 120, and the control switch 140 is clearly explained in the embodiment of Figure 1, so a repeated explanation will be omitted.

[0032] In this embodiment, the energy storage circuit 330 includes switches SW1 and SW2, an energy storage battery 331, and a resistor 332. The first terminal of switch SW1 is coupled to the first power supply terminal T1. The energy storage battery 331 is coupled between the second terminal of switch SW1 and the control switch 140. The first terminal of switch SW2 is coupled to the first power supply terminal T1. The resistor 332 is coupled between the second terminal of switch SW2 and the control switch 140.

[0033] In this embodiment, a second set voltage value VS2 is set that is higher than the first set voltage value VS1. When the voltage value V1 at the first power terminal T1 is higher than the first set voltage value VS1, the drive unit 300 turns on the control switch 140 and switch SW1 and turns off switch SW2. When the voltage value V1 at the first power terminal T1 is higher than the second set voltage value VS2, the drive unit 300 turns on the control switch 140 and switches SW1 and SW2. For example, the first set voltage value VS1 is, for example, 340 volts. The second set voltage value VS2 is, for example, 360 volts.

[0034] In this embodiment, if the voltage value V1 at the first power terminal T1 is higher than the second set voltage value VS2, and the charging current IB flowing through the energy storage battery 331 is higher than the set current value IS, this means that the charging current IB is too high. The drive unit 300 turns on the control switch 140 and switches SW1 and SW2. Therefore, the resistor 332 provides a current shunt path, thereby reducing the charging current IB flowing through the energy storage battery 331.

[0035] When control switch 140 and switches SW1 and SW2 are turned on, if the duration for which the charging current IB flowing through the energy storage battery 331 is higher than the set current IS is longer than the set duration, this means that the charging current IB is still too high, even though resistor 332 provides a current shunt path. Therefore, the drive unit 300 turns on control switch 140 and switch SW2 and turns off switch SW1. Consequently, the conversion circuit 120 does not charge the energy storage battery 331 and absorbs electrical energy using resistor 332.

[0036] Furthermore, a third setting voltage value VS3 is set that is higher than the second setting voltage value VS2. When the control switch 140 and switches SW1 and SW2 are turned on, if the voltage value V1 at the first power terminal T1 is higher than the third setting voltage value VS3, the voltage value V1 at the first power terminal T1 continues to rise until it becomes higher than the third setting voltage value VS3. Therefore, the drive unit 300 turns on the control switch 140 and switch SW2 and turns off switch SW1. Consequently, the conversion circuit 120 does not charge the energy storage battery 331 and absorbs electrical energy using the resistor 332. In this embodiment, the third setting voltage value VS3 may be the maximum withstand voltage value of the energy storage battery 331 and / or the battery module 110. For example, the third setting voltage value VS3 may be, for example, 380 to 400 volts.

[0037] In this embodiment, the control circuit 350 can receive the voltage value V1 of the first power terminal T1 and the current value IB of the charging current IB of the energy storage battery 331. Based on the voltage value V1 of the first power terminal T1 and the current value IB of the charging current IB flowing through the energy storage battery 331, the control circuit 350 can perform switching control operations of the control switch 140 and switches SW1 and SW2. For example, the control circuit 350 is coupled to the first power terminal T1 and the energy storage circuit 330. The control circuit 250 can control the control switch 140 using the switching signal SSWB, control switch SW1 using the switching signal SSW1, and control switch SW2 using the switching signal SSW2.

[0038] Furthermore, the control circuit 350 can also control the switching operation of the power switches PS1 to PS6 of the conversion circuit 120.

[0039] In this embodiment, switches SW1 and SW2 may be implemented by any type of transistor switch or relay.

[0040] Referring to Figures 1 and 4, Figure 4 is a flowchart of an operation method according to one embodiment of the present invention. In this embodiment, operation method S100 is used in the drive device 100. Operation method S100 includes steps S110 to S140. In step S110, the drive device 100 receives the voltage value V1 of the first power terminal T1 of the battery module 110. In step S120, the drive device 100 determines whether the voltage value V1 of the first power terminal T1 is higher than a first set voltage value. If the voltage value V1 of the first power terminal T1 is higher than the first set voltage value, the drive device 100 turns on the control switch 140 in step S130 so that the energy storage circuit 130 can store electrical energy in the first power terminal T1. Then the drive device 100 returns to step S110.

[0041] On the other hand, if the voltage value V1 at the first power supply terminal T1 is less than or equal to the first set voltage value, the drive unit 100 turns off the control switch 140 in step S140. Then, the drive unit 100 returns to step S110.

[0042] The details of the implementation of steps S110 to S140 are clearly explained in the embodiments shown in Figures 1 to 3, so a repeated explanation will be omitted.

[0043] Refer to Figures 2, 3, and 4. In some embodiments, the operating method S100 further includes controlling the switching control operation of the control switch 140 and switches SW1 and SW2 based on the voltage value V1 of the first power terminal T1 and the current value of the charging current IB flowing through the energy storage battery 331.

[0044] In summary, the drive unit includes a battery module, a conversion circuit, an energy storage circuit, and a control switch. The conversion circuit is coupled to the motor, the first power terminal of the battery module, and the second power terminal of the battery module. The control switch and the energy storage circuit are connected in series between the first and second power terminals. When the voltage value at the first power terminal is higher than a first set voltage value, the drive unit turns on the control switch, allowing the energy storage circuit to store electrical energy at the first power terminal. If the voltage value at the first power terminal is too high, the energy storage circuit can store electrical energy at the first power terminal, reducing the risk of damage to the electrical energy at the first power terminal. This can extend the service life of the drive unit.

[0045] Although the present invention has been disclosed through the embodiments described above, it is not intended to limit the invention. Anyone skilled in the art may make some changes or modifications without departing from the spirit and scope of the invention, and the scope of protection of the present invention shall be determined by the scope of the appended patent application. [Industrial applicability]

[0046] This invention provides a motor drive unit and an operating method for the drive unit that can reduce the risk of damage to the electrical energy from the motor. Therefore, the service life of the drive unit can be extended. [Explanation of symbols]

[0047] 100, 200, 300: Drive unit 110: Battery module 120: Conversion Circuit 130, 230, 330: Energy storage circuits 140: Control switch 231, 331: Energy storage batteries 250, 350: Control circuits 332:Resistor D1, D2, D3, D4, D5, D6, DB: Diode IB: Charging current IS: Set current value MTR: Motor PB1, PB2: Battery Electrical Energy PS1, PS2, PS3, PS4, PS5, PS6: Power switch S1, S2, S3, S4, S5, S6, SSW1, SSW2, SSWB: Switching signals S100: How it works S110, S120, S130, S140: Process SW1, SW2: Switches T1: 1st power supply terminal T2: 2nd power supply terminal TB: Transistor V1: Voltage value VS1: First set voltage value VS2: Second set voltage value VS3: Third set voltage value

Claims

1. A drive device for motor drive, Battery module and The motor, the first power terminal of the battery module and the second power terminal of the battery module are connected to a conversion circuit, Energy storage circuit, A control switch connected in series with the energy storage circuit between the first power terminal and the second power terminal, Includes, If the voltage value of the first power terminal is higher than the first set voltage value, the drive device turns on the control switch so that the energy storage circuit can store electrical energy at the first power terminal. Drive unit.

2. The aforementioned energy storage circuit is A first switch whose first terminal is connected to the first power supply terminal, An energy storage battery coupled between the second terminal of the first switch and the control switch, The drive device according to claim 1, including the drive device described in claim 1.

3. If the voltage value of the first power terminal is higher than the first set voltage value, the drive device turns on the control switch and the first switch. The drive device according to claim 2.

4. The aforementioned energy storage circuit is A second switch whose first terminal is connected to the first power supply terminal, A resistor coupled between the second terminal of the second switch and the control switch, The drive device according to claim 2, further comprising:

5. If the voltage value of the first power terminal is higher than the second set voltage value, the drive device turns on the control switch, the first switch and the second switch. The second set voltage value is higher than the first set voltage value. The drive device according to claim 4.

6. If the voltage value at the first power terminal is higher than the second set voltage value, and the current value of the charging current flowing through the energy storage battery is higher than the set current value, the drive device turns on the control switch, the first switch, and the second switch. The drive device according to claim 5.

7. When the control switch, the first switch, and the second switch are on, if the duration for which the charging current value flowing through the energy storage battery is higher than the set current value is longer than the set duration, the drive device turns on the control switch and the second switch and turns off the first switch. The drive device according to claim 5.

8. When the control switch, the first switch, and the second switch are on, and the voltage value of the first power terminal is higher than the third set voltage value, the drive device turns on the control switch and the second switch and turns off the first switch. The third set voltage value is higher than the second set voltage value. The drive device according to claim 5.

9. The aforementioned battery module is implemented using aluminum-ion batteries. The drive device according to claim 1.

10. A method of operation for a drive device, The drive device is used to drive a motor, and the drive device includes a battery module, a conversion circuit, an energy storage circuit, and a control switch, the conversion circuit is coupled to the motor, the first power terminal of the battery module, and the second power terminal of the battery module, the control switch and the energy storage circuit are coupled between the first power terminal and the second power terminal, The aforementioned operation method is, Receiving the voltage value of the first power supply terminal, The method includes, if the voltage value of the first power terminal is higher than a first set voltage value, turning on the control switch so that the energy storage circuit can store electrical energy from the first power terminal, A method of operation for a drive device.

11. A first switch whose first terminal is connected to the first power supply terminal, An energy storage battery coupled between the second terminal of the first switch and the control switch, The operating method according to claim 10, including the method described in claim 10.

12. If the voltage value of the first power terminal is higher than the first set voltage value, the control switch and the first switch are turned on. The operating method according to claim 11, further comprising:

13. The aforementioned energy storage circuit is A second switch whose first terminal is connected to the first power supply terminal, A resistor coupled between the second terminal of the second switch and the control switch, The operating method according to claim 11, further comprising:

14. If the voltage value of the first power terminal is higher than the second set voltage value, the control switch, the first switch, and the second switch are turned on. Furthermore, The second set voltage value is higher than the first set voltage value. The operating method according to claim 13.

15. If the voltage value of the first power terminal is higher than the second set voltage value, and the current value of the charging current flowing through the energy storage battery is higher than the set current value, the control switch, the first switch, and the second switch are turned on. The operating method according to claim 14 further includes.

16. When the control switch, the first switch, and the second switch are on, if the duration for which the charging current value flowing through the energy storage battery is higher than the set current value is longer than the set duration, the control switch and the second switch are turned on, and the first switch is turned off. The operating method according to claim 14, further comprising:

17. When the control switch, the first switch, and the second switch are on, and the voltage value of the first power terminal is higher than the third set voltage value, the control switch and the second switch are turned on, and the first switch is turned off. It further includes, The third set voltage value is higher than the second set voltage value. The operating method according to claim 14.

18. The aforementioned battery module is implemented using aluminum-ion batteries. The operating method according to claim 10.

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